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Introducing Post Limit Checker
Post Limit Checker is a very, very experimental new extension that allows you to see how many posts you’ve made since the last reset and how many you can reblog until it is reset again.
Just download it from the extension gallery and select your blog from the blog selector on your dashboard (tumblr.com/blog/[url]) and click on the “Check Post Limit” button on your dashboard to get started.